Image Tools
Aspect Ratio Calculator
Find aspect ratios from dimensions or scale width and height to 16:9, 9:16, 1:1 and more.
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About the Aspect Ratio Calculator
Aspect ratio is the relationship between an image or video’s width and height (for example 16:9 for YouTube or 9:16 for Reels). Getting the ratio right avoids awkward crops on social platforms and keeps layouts consistent on the web.
Use this free calculator to simplify any pixel size to a clean ratio, preview the shape, and copy CSS aspect-ratio or padding-bottom snippets for responsive design.
How to use this aspect ratio calculator
- Enter width and height in pixels, or pick a preset like 16:9 or 1:1.
- Read the simplified ratio, decimal value, and live preview.
- Copy the CSS snippet into your stylesheet or design notes.
Frequently asked questions
What is aspect ratio?
Aspect ratio compares width to height. A 1920×1080 video simplifies to 16:9 — the same shape at any resolution.
Which ratio should I use for Instagram Reels?
Reels and TikTok Shorts typically use 9:16 (vertical). Feed posts often use 1:1 or 4:5.
Is this tool free?
Yes. It runs entirely in your browser on Mytulify — unlimited use, no signup.